﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace 深入浅出WPF_Chapter7依赖属性
{
    /// <summary>
    /// Sample3.xaml 的交互逻辑
    /// </summary>
    public partial class Sample3 : Window
    {
        public Sample3()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Human human = new Human();
            School.SetGrade(human, 6);
            int grade=School.GetGrade(human);
            MessageBox.Show(grade.ToString());
        }
    }

    class School : DependencyObject
    {


        public static int GetGrade(DependencyObject obj)
        {
            return (int)obj.GetValue(GradeProperty);
        }

        public static void SetGrade(DependencyObject obj, int value)
        {
            obj.SetValue(GradeProperty, value);
        }

        // Using a DependencyProperty as the backing store for Grade.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty GradeProperty =
            DependencyProperty.RegisterAttached("Grade", typeof(int), typeof(School), new PropertyMetadata(0));


    }

    class Human : DependencyObject { }
}
